1. R. Livingston, J. Chem. Phys. 57, 496 (1953).JCPSA60021-9606
2. H. Robinson, H. G. Dehmelt, and W. Gordy, J. Chem. Phys. 22, 511 (1954).JCPSA60021-9606
3. A. L. Schawlow, J. Chem. Phys. 22, 1211 (1954).JCPSA60021-9606
4. H. Barfuss, G. Böhnlein, P. Freunek, R. Hofmann, H. Hohenstein, W. Kreische, H. Niedrig, and A. Reimer, Hyp. Int. 10, 741, 1051 (1981).HYINDN0304-3843
5. E. W. Richter and D. Wiegandt, Z. Phys. 217, 225 (1968).ZEPYAA0044-3328